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Re: ignore_killed_tuples is always true

From: ITAGAKI Takahiro <itagaki(dot)takahiro(at)lab(dot)ntt(dot)co(dot)jp>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Jaime Casanova <systemguards(at)gmail(dot)com>, pgsql-patches(at)postgresql(dot)org
Subject: Re: ignore_killed_tuples is always true
Date: 2006-02-13 02:30:19
Message-ID: 20060213111511.49B5.ITAGAKI.TAKAHIRO@lab.ntt.co.jp (view raw or flat)
Thread:
Lists: pgsql-patches
Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> It's not saving any noticeable amount of code, and what it is doing
> is removing functionality we might want someday.  It's not hard to
> imagine pgstattuple or VACUUM or other maintenance operations wanting
> to look at killed index entries.

I suggested it not for performance, but for simplicity of code. So if we
still need it, I agree to leave it.

Moreover, LP_DELETEed tuples might be useful for Bitmap NOT And/Or join,
not only maintenance operations. Union-side of bitmap should not contain
LP_DELETEed tuples, and Except-side should do.

---
ITAGAKI Takahiro
NTT Cyber Space Laboratories



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